GasTech GTA-4100R Operator's Manual page 17

The terminals for these common relays are located on the right hand side of the circuit board next to channel
one and two. The terminals are 2.5mm top mounted plug in different colour to the channel inputs. The
terminals are clearly marked on the PCB.
TM
With the Micro Rack version common module functions the same as the standard 19" rack case version
except that there is only one set of relays, so you cannot zone the top and bottom of the cards.
Page 13
19" Rack Mount Common Module Backplane
TM
Micro Rack Common Module
Zone 1 common Alarm 2
Zone 1 common Alarm 1
Zone 1 common fault
Zone 2 common Alarm 2
Zone 2 common Alarm 1
Zone 2 common fault
© 2008 GasTech Australia Pty Ltd
N/O
Com
N/C
Common Alarm 2
Common Alarm 1
Common fault